Ferdinand Gotthelf Hand, Professor of Greek Literature at the University of Jena, died on the 14th March, at the age of sixty-five. He is best known for his work on the Æsthetik der Foukunst. He had filled his professorship since 1817.
M. Jacobi died on the nineteenth of February at Berlin. He was well known to the scientific world by his electro-chemical researches.
Hans Christian Oersted, the great Danish naturalist, died at Copenhagen on the seventeenth of March, aged seventy-four. He was the son of an apothecary of Rudkjobing, in the province of Larzeland. Fourteen days before his death he gave a scientific lecture at the University of Copenhagen, where he was Professor of Natural Science. He was nearly of the same age with Thorwaldsen and Oehlenschlager. His last work, Der Geist in der Natur, was not long since the subject of remark in these pages. His fame as the discoverer of electro-magnetism, (which discovery he made, after laborious researches, on the fifth of June 1821,) and as a profound and genial thinker, will be immortal.
At Rudkjobing he received his early education with his brother Anders Sandöe Oersted, a distinguished senator of Denmark, and for some years one of the ministers of state. Christian Oersted was sent to Copenhagen to study medicine. After completing his course of pharmacy, he directed his powers to the study of natural philosophy, and greatly distinguished himself in that science, of which he subsequently became University Professor. His grand discovery of electro-magnetism led to the subsequent development of the electric telegraph. In 1807 he wrote his work reviving the hypothesis of the identity of magnetism and electricity, in which he arrived at the conclusion—that "in galvanism the force is more latent than in electricity, and still more so in magnetism than in galvanism; it is necessary, therefore, to try whether electricity, in its latent state, will not affect the magnetic needle." No experiment appears, however, to have been made to determine the question until 1820, when Oersted placed a magnetic needle within the influence of a wire connecting the extremities with a voltaic battery. The voltaic current was now, for the first time, observed to produce a deviation of the magnetic needle in different directions, and in different degrees, according to the relative situation of the wire and needle. By subsequent experiment Oersted proved that the wire became, during the time the battery was in action, magnetic, and that it affected a magnetic needle through glass, and every other non-conducting body, but that it had no action on a needle similarly suspended, that was not magnetic. To Professor Oersted is also due the important discovery, that electro-magnetic effects do not depend upon the intensity of the electricity, but solely on its quantity. By these discoveries an entirely new branch of science was established, and all the great advances which have been made in our knowledge of the laws which regulate the magnetic forces in their action upon matter, are to be referred to the discovery by Oersted, that by an electric current magnetism could be induced. He promulgated a theory of light, in which he referred luminous phenomena to electricity in motion; it has not, however, been favorably received.
One of the most important observations first made by him, and since then confirmed by others, was, that a body falling from a height not only fell a little to the east of the true perpendicular—which is, no doubt, due to the earth's motion—but that it fell to the south of that line; the cause of this is at present unexplained. It is, no doubt, connected with some great phenomena of gravitation which yet remain to be discovered. At the meeting of the British Association at Southampton, Professor Oersted communicated to the Chemical Section some curious examples of the influence of time in determining chemical change, as shown in the action of mercury upon glass in hermetically sealed vessels. The character of Professor Oersted's mind was essentially searching and minute; thus he observed results which escaped detection in the hands of those who took more general and enlarged views of natural phenomena. To this was due the discovery of electro-magnetism, which will for ever connect his name with the history of inductive science. As Director of the Polytechnic Institution of Copenhagen, of which he was the founder, and of the Society for the Diffusion of Natural Sciences, and as Perpetual Secretary of the Royal Academy of Sciences since 1815, his labors were unceasing and of great benefit to his country. He was for many years attached to the Military College of Cadets of Copenhagen, and only resigned when he could be succeeded by one of his own pupils. His manners and demeanor were extremely modest and unobtrusive. The British Royal Society awarded him the Copley Medal for his discovery in electro-magnetism, and the Academy of Sciences of Paris presented him with their Gold Medal. Both Societies elected him a Foreign Member.
Henri Delatouche, who died early in March at Aulnay, France, was born February 3d, 1785. His first work was Fragoletta, a book treating in an original way the revolution of Naples in 1799; it was the fruit of a long sojourn in Italy, a genuine production of genius, in which the chapters devoted to antique art are especially remarkable. During the Hundred Days he was the secretary of Marshal Brune, and was made sub-prefect of Toulon. The downfall of Napoleon deprived him of office, and restored him to literature and general politics. During the Restoration he gained great applause by his eloquent and successful defence of his father, who was tried before a political court, and but for his son would have been one of the victims of that bloody period. He was prominent in the agitation of public questions through that time, and through the ten first years of Louis Philippe. He was intimate with B. Constant Chateaubriand, Madame Recamier, Gros, Gerard, Armand Carrel, Godfrey Cavaignac, Beranger, and George Sand. He was one of the editors of the National, and the chief writer of the brilliant and effective Figaro. His books were Fragoletta, Aymar, France et Marie, Lettres de Clement XIV. et de Carlo Bertinazzi, Les Adieux. Though he adopted the form of romance, the purpose of his writings was historical and didactic. In the latter part of his life he made preparations to write a Histoire des Conjurations pour la Liberté, but did not accomplish it. He was a man of noble character and remarkable genius. His conversation was brilliant and fascinating. Since Diderot, it is said that France has produced no talker to be compared with him. George Sand frequently compares him to Rousseau. Like that philosopher, toward the close of his life he manifested a passionate love of nature and solitude. He spent his time laboring in his garden, and living in the most frugal manner. The aged and manly poet was beloved of the neighboring peasants, as well as by the friends he had left behind him in the great world; and though he had often criticised his contemporaries with extreme severity, sometimes even with injustice, he left no enemies.